Planetary transmission gearing



Sept. 6, 1927.

J. S. BARNETT PLANETARY TRANsMs sIoN GEAR ING Filed May 29, 1923 2 Sheets-Sheet l n La: y

INVENTOR. J Si Eff/gva TT /'a ATTORNEY Se t. l

p 6' 927, J. s. BARNETT I PLNETARY TRANSMISSION GEARING 2 Sheets-Sheet 2 Filed May 29, 19231 Patente-d Sept. 6, 1927,

sil .a fra Jorrit s. Brennern or oAigLaNn, CALIFORNIA.

y rnaivnranv,Tnansiarssioiv. ernannte. i

Application aieanay 29,

My invention relates to a planetary gearing mechanism for power transmission, 'and particularly to the type wherein the drive and driven members are coaxially mounted.

vAnobject of my invention is to provide av planetary gearing mechanism for the transmission of power between coaxially mounted powermembers which is'highly efficient, simple and compact.

Another yobject of my invention is to pro'- vide a device of the character described which provides means whereby the direction The invention possesses other objects and.

features of advantage, some of which, with the foregoing, will be set forth in the fol'- lowing description of the preferred form of my invention which is illustrated' in the drawings accompanying and forming part ofthe specification. t is tov be understood that I do not limit myself to the showing madefbyth'e said drawings and description,`

l as I ina-y adopt variations of the preferred form withinthe scope of my invention as set forth in the claims.

` Referring to said drawings: f

Figure lis an end view of the mechanism of 'my invention. Y

Figure 2 is a longitudinal section taken on the line 2-'2 'in Figure 1j. y Figure4 3- is a-view ofthe portion of my device/takenl behind the broken line 3-3 in Figure'2. Figure t is a view of the portion of my device lyingb'etween the lines 4-4- .and in Figure 2; v n

Figure 5 is a fragmentary view similar to Figure 3 showing a slightly modified forni of theinventjion. 4 Briefly expressed, the power transmission means ofmy inventionA as here shown comprises'a shaft ,andi coaxiallymounted drive anddiri-v'efii members associated` therewith which lareV operativel connectedfto: each other andfto the' sha t' by a novel geari-ng arrangement. The 'said gearing includes. a-

planetary gear mounted ron a disk whichr is revoliible about the shaft, andf a floating 1923. serial Np. 642,174.

ring gear associated with said-planetary gear. "The device is preferably so constructed that if any one ofsaid members o'r shaft is'held-1iXed,*rotatioirof,onel of the others 'will produce rotation of the third.

relative totheother two.'4` I A detailed description follows:

In the presentwembodiment of 'my -inveny tion a power wheel 6 having ajhubT and rim 8 is'lniounted for rotationfabout a shaft 5. Mounted adjacent said 'powerA wheel for rotationabout Lsaid shaftis a driven wheel 9; having a hub 11 and riinV l2 ysomewhat similar to the wheel 6.- "A hub l'cairying a disk 14' is mounted for rotation about said Suitable antifrction bearings 10 yare preferablyl arranged in' `thefdi'fferent hubs.

Later shaft between the hubs.` 7. and 9V which are 'l spaced tov allow interposition ofthe hub 13.

Mounted on thedislr 14 are'stub Vshafts 15, 16 and 17 disposed parallel-to said shaft 5'. v

Fixed tosaidr shaft 5 adjacent the inner end of the hub 11 is an arm18 carrying thereon a stub shaft llarranged'` parallel to the shaft 5. c c L Fixed to tlierim 8v is an internal gear 21' which is concentric with the shaft 5 and whichV ymeshes with a planetary 'gear22 mounted for rotation aboutthe stub shaft 15. A pinion23 is also mounted for rotation about the stub shaft15andis connected with the lgear 22' for rotation therewith. Thefgear 23 is positionedv in theplane of an internal gear 425 which is fixed tothe wheel if rim 1'2 anda is concentric with the shaft 5. Mounted between` the pinion and the internal gear 25 is a rin-g- ,gearf 24; adapted to mesh with'` the pinionfand internall gea-r at diametrically oppositel points of the c ring gear..l Secured to the rim 12 is a second internal gear 26 which engages a pinion 27 mounted for rotation about the stub shaft 19, the pinion 27 in` turn engaging a gear 28 Xed to. theliub 15.A It will. thus i be 'seen that the power is transmitted from the wheel 6 to the wheel 9 by means of' the gears and pinions 21, 22, 23, 2,4: and 25V in order, and that thegears and pinions 26,27 and 28V combi-ne to provide -a fixed p oint about whichY the system; operates. Thefring gear is held con-tactuallypositioned with c* respect to the internal gear 25 by meansof rollers 32; engaging the inner circumference thereof and mounted onV the stubl shaft 16 and '17. The ringgear,` by reason of,` thel rollers dien-gearsr engaging it,v rotatesD constantly'about Vthe same axis, hence the rollers 32 may be variously placed to provide the necessary Contact. However, it has been found that placing these rollers symmetrically disposed with respect to the opposite points of engagement of the ring gear, and with their line of centers slightly closer to the teeth of the internal gear 25 than to the teeth of the pinion 24 at the points of engagement, results in a minimum of friction between the parts involved and thus increases the efficiency of the entire device.

Formed in the ring gear 24 are annular shoulders 31 which are arranged to circumferentiallyengage annular flanges 33 and 34 arranged on opposite sides of the gears 25 and 23 respectively. In this manner the ring gear is held against longitudinal and transverse displacement and vthe gears held in proper relative positions, thereby preventing any binding. The teeth of the ring gear are preferably formed slightly narrower than the space between the flanges, thus minimizing the side friction between said members.

By mounting the hub 1l in a bearing 36 a belt pulley 37 may be attached to the o uter end of said hub as shown. However, it is readily seen that the shaft may itself be mounted lin a bearing or mounting to produce the same result. As here shown,.the end of the shaft adjacent the hub 7 is fixed in a mounting 38, said bearing and mounting together supporting the device in any desired position. It will also be evident that one or both of the rims may be adapted for use as pulleys or may be otherwise adapted for driving connections.

By .fixing either one of members 8 0r 12 against rotation and allowing the shaft to rotate, it will be evident that power may be transmitted between the free member and the shaft. It is also to be noted that the mechanical advanage of the device may be varied by-appropriately varying the diameters of the various gears in the system. Re-

versal of the direction Vof rotation of the vdriven wheel relative to the power wheel may be readily effected by mounting an idler pinion 4() on the disk 14 and interposed between and engaging the internal gear 2l and the planetary gear 22, which are separated tov eliminate direct contact between them.

It will be clear from the construction here shown that the device is reversible in action, thereby making it particularly applicable for `use in `coiiection with 'reversible ma- -chines or as a gear chain hoist.

said shaft, a ring gear engaging one of saidV latter gears, a supporting element rotatably mounted on said shaft, a pair of relatively fixed planetary gears rotatably carried by said supporting element and engaging said first internal gear and said ring gear, land driving connections between the other of said pair of internall gears and said shaft.

2. A planetary transmissionV gearing oom- 1 prising a fixed shaft, an internal gear T- gear, a supporting element fixed to said shaft, a pinion carried on said latter supporting element and meshing with one of said pair of internal gears, and a gear coaxially fixed to said first supporting element and meshing with saidlatter pinion. I v

3. A planetary transmission gearing comprising a fixed shaft, a rotatable member mounted for rotation about said shaft and provided with an internal gear, a planetary. pinion mounted for movement about said shaft and arranged to be driven by said in- I ternal gear, a second rotatable member mounted for rotation about said shaft adjacent said first rotatable member and provided with an internal gear, a ringl gear ec-j centrically mounted in alignment with and for engagement'between said pinion and said second internal gear, annular flanges coaxially mounted on said pinion and on said second internal gear and engaging Vannular shoulders provided on said ring gear, a roller arranged to continuously engage the inner circumference of said ring gear, and gear means operatively connecting said second rotatable member with said shaft.

4. A planetary transmission gearing comprising a fixed shaft, a rotatable member mounted for rotation about said shaft and provided with an internal gear, a second rotatable member mounted for rotation about said shaft adjacent said first rotatable meinber and provided with an internal gear, a hub mounted for rotation about said shaft between said rotatable members, a supporting element mounted on said hub for rotation therewith, a planetary pinion rotatably carried by said element and engaging said first internal gear, a second pinion coaxially mounted for rotation with said first pinion, a ring gear eccentrically mounted in alignment with and engagement between said second pinion and the internal gear ofthe second rotatable member, means associated with said second internal gear and with said second `pinion for holding the ring gear ill() llt? aligned therewith and properly positioned with respect thereto, a second internal gear mounted on said second rotatable member, an arm fixed to and extending transversely from said shaft, a gear concentrically mounted on said hub adjacent said arm, and a pinion fixed to said arm and engaging between said second internal gear of said second member and said last mentioned pinion.

5. A planetary transmission gearing comprising fixed shaft, a rotatable member mounted for rotation about said shaft and provided with an internal gear, a second rotatable member mounted for rotation about said shaft adjacent said first rotatable member and provided with an internal gear, a hub mounted for rotation about said shaft between said rotatable members, a supporting element mounted on said hub for rotation therewith, a planetary pinion rotatably carried by said element and engaging said first internal gear, a second pinion coaxially mounted for rotation with said first pinion, a ring eccentrically mounted in alignment with and engagement between said second pinion and the internal gear of the second rotatablemember, annular shoulders arranged on said ring gear, annular flanges mounted on said second pinion and onl the internal gear of the second rotatable member 'engaging said annular shoulders, a roller engaging the inner circumference of said ring gear, and gear means operatively connecting said second rotatable member with said hub.

6. A transmission gearing comprising a shaft, a pair of gears mounted for rotation about said shaft, a supporting element independently mounted onV said shaft for rotation thereabout, a planetary gear mounted for rotation on said element and engaging one of said gears, a ring gear operatively connected with said planetary gear and the other of said pair, and means carried by said elen'ient and shaft operatively connecting one of said gears to said shaft for rotation about said shaft.

7. in a gearing, a shaft, a drive gear mounted for rotation about and with respect to said shaft,a driven gear mounted for ro tation about and with respect to said shaft, an independently mounted planetaryv gear arranged to maintain operative engagement with one of said first gears, and driving connections between said planetary gear and the other of said first gears.

8. A gearing comprising a shaft provid ing the sole support therefor, a p airvofy internal gears independently mounted for rotation about said shaft, a supporting element rotatably mounted on said shaft, a pair of relativelyv fixed planetary gears rotatably carried by said supporting element, one of said planetary gears being operatively engagedwith anintei'nal gear, and means operatively connecting the other` of said planetary gears with said shaft and the other of said internal gears.

9. A gearing comprising a shaft, a mem-` ber provided with an internal gear mounted for coaxial rotation about said shaft, a second member provided with a pair of relatively fixed internal gears mounted'for coaxial rotationabout said shaft, gear means operatively connecting the internal gear of said first member with one of the internal gears of vsaid second lmember, and gear means operatively connecting the other in- -ternal gear of said second member with said shaft. I Y,

l0. A gearing comprising ashaft, a member provided with an internal gear and mounted for rotation about said shaft, a second member provided with a pair of relatively fixed internal gears mounted for rotation about said shaft, gear means operatively connecting the internal gear of said first member with one of the internal gears of said second member, and a gear mounted in fixed and eccentric relation to said shaft arranged to operatively connect the second internal gear of said second member and.

said shaft.

1l. A gearing comprising a shaft, a member provided with an internal gear arranged for coaxial rotation about said shaft, a second member provided with a pair of relatively fixed internal gears arranged for co-,

JOHN S. BARNETT.

Cil 

